1. Microbial diversity

   • Alan T. Bull

   Editorial Pages: 219 - 220

2. Microbial Diversity 21: biodiversity amongst microorganisms and its relevance

   • David L. Hawksworth
   • Rita R. Colwell

   Introduction Pages: 221 - 226

3. Prokaryotes: an overview with respect to biodiversity and environmental importance

   • H. G. Trüper

   Papers Pages: 227 - 236

4. Molecular methods of analysing bacterial diversity: the case of Rhizobia

   • Hiroshi Oyaizu
   • Naohiro Naruhashi
   • Takuma Gamou

   Papers Pages: 237 - 249

5. Unculturable microbes detected by molecular sequences and probes

   • W. Liesack
   • E. Stackebrandt

   Papers Pages: 250 - 262

6. Concept of virus species

   • M. H. V. van Regenmortel

   Papers Pages: 263 - 266

7. Diversity of eukaryotic algae

   • R. A. Andersen

   Papers Pages: 267 - 292

8. Biodiversity amongst filamentous fungi

   • F. Oberwinkler

   Papers Pages: 293 - 311

9. Biodiversity: a lichenological perspective

   • D. J. Galloway

   Papers Pages: 312 - 323

10. Biodiversity and conservation of yeasts

    • A. Martini

    Papers Pages: 324 - 333

11. The diversity and ecological significance of Protozoa

    • K. Vickerman

    Papers Pages: 334 - 341

12. Biodiversity amongst microorganisms and its relevance

    • R. R. Colwell

    Concluding Remarks Pages: 342 - 345

13. Biodiversity conservation after Rio

    • Martin W. Holdgate

    Comment Pages: 346 - 347

14. Book review

    • J. D. Holloway
    • J. Green
    • D. A. Thomas

    BookReview Pages: 348 - 353

15. Books received

    BookReview Pages: 354 - 355